US3853110A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oil pressure detector
Assignee: Individual
•
Filing: 1973-03-12
•
Granted: 1974-12-10
•
Expires: 1993-03-12
Abstract
Abstract The invention is concerned with a safety device for a fuel driven engine which is lubricated by liquid lubricant under pressure. The invention is particularly concerned with such a safety device comprising a first operating member; a first spring acting on the first operating member to bias the latter into a first position; a pressure sensitive device adapted to be subject to the pressure of the liquid lubricant and being connected to the first operating member to move the latter from its first position to a second position when the pressure detected is more than a predetermined minimum; a second operating member normally movable freely relative to the first operating member from a first position to a second position; second spring means for biassing the second operating member into its first position; and detector means for detecting when a predetermined operation has taken place and for moving the second operating member into its second position when such predetermined operation has taken place. The invention provides locking means for locking the second operating member in its second position, which locking means is controlled by the first operating member when in its second position.
Inventors
- 👤 Der Merwe I Van
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:27
CPC Classifications
F; F01; F01M; F01M1/00; F01M1/18; F01M1/20; F01M1/22; F01M1/24
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
179 words
A safety device for a fuel driven engine which is lubricated by liquid lubricant under pressure and comprising a first operating member; a first spring acting on the first operating member to bias the latter into a first position; a pressure sensitive device adapted to be subject to the pressure of the liquid lubricant and being connected to the first operating member to move the latter from its first position to a second position when the pressure of the lubricant is more than a predetermined minimum; a second operating member normally movable freely relative to the first operating member from a first position to a second position; second spring means for biassing the second operating member into its first position; and detector means for detecting when a predetermined operation has taken place and for moving the second operating member into its second position when such predetermined operation has taken place, further comprising locking means for locking the second operating member in its second position, which locking means is controlled by he first operating member when in its second position.
Claim 2
Dependent Claim
179 words
A safety device for a fuel driven engine which is lubricated by liquid lubricant under pressure and comprising a first operating member; a first spring acting on the first operating member to bias the latter into a first position; a pressure sensitive device adapted to be subject to the pressure of the liquid lubricant and being connected to the first operating member to move the latter from its first position to a second position when the pressure of the lubricant is more than a predetermined minimum; a second operating member normally movable freely relative to the first operating member from a first position to a second position; second spring means for biassing the second operating member into its first position; and detector means for detecting when a predetermined operation has taken place and for moving the second operating member into its second position when such predetermined operation has taken place, further comprising locking means for locking the second operating member in its second position, which locking means is controlled by he first operating member when in its second position.
Claim 3
Dependent Claim
52 words
A safety device as claimed in claim 1 wherein the second spring acts on the first operating member through the second operating member when the latter is not locked in its second position by the locking means to supplemEnt the first spring in biassing the first operating member to its first position.
Claim 4
Dependent Claim
118 words
A safety device as claimed in claim 1 wherein the second operating member comprises a stem having a peripheral groove therein, the stem passing through a boss having at least one radial passage and being arranged so that the groove its opposite the passage when the second operating member is in its second position, wherein there is a ball in the passage and wherein the first operating member has a skirt a part of which when the first operating member is in its second position, fits over the boss, the arrangement being such that when the skirt fits over the boss, the ball is held in the groove by the skirt thereby locking the stem to the boss.
Claim 5
Dependent Claim
19 words
A safety device as claimed in claim 1 wherein the second spring is considerably stronger than the first spring.
Claim 6
Dependent Claim
25 words
A safety device as claimed in claim 1 wherein the first operating member is a valve for cutting off the fluid supply to the engine.
Claim 7
Dependent Claim
29 words
A safety device as claimed in claim 5 wherein the second operating member comprises a by-pass device to allow a small amount of fuel to pass through the device.
Claim 8
Dependent Claim
37 words
A safety device as claimed in claim 1 incorporating switch means adapted to be connected into the electric circuit of the engine and wherein the switch means is adapted to be actuated by one of the members.
Claim 9
Dependent Claim
34 words
A safety device as claimed in claim 7 wherein the switch means comprises a pair of contacts projecting into the device and a bridging member which is carried by one of the operating members.
Claim 10
Dependent Claim
17 words
A safety device as claimed in claim 8 wherein the first operating member carries the bridging member.
Claim 11
Dependent Claim
72 words
A safety device as claimed in claim 9 wherein the second operating member is able to move the first operating member only towards its first position and wherein there is provided a time delay device connected to the contacts to delay the operation of the safety device so as to enable the engine in use to start operating and the liquid lubricant pressure to build up before the safety device becomes operative.
Claim 12
Dependent Claim
17 words
A safety device as claimed in claim 8 wherein the second operating member carries the bridging member.
Claim 13
Dependent Claim
29 words
A safety device as claimed in claim 11 wherein the second operating member is freely movable relative to the first operating member except when locked in its second position.
Claim 14
Dependent Claim
37 words
A safety device as claimed in claim 1 wherein the detector means comprises a piston subject to fluid pressure on operating of any one of the following devices namely a clutch, a brake and a starting lever.
Claim 15
Dependent Claim
45 words
A safety device as claimed in claim 13 wherein the fluid pressure is pneumatic preasure and wherein there is provided means for allowing the air to bleed to relieve the pressure on the piston should the device remain in its operative position for too long.
Claim 16
Dependent Claim
45 words
The combination of a safety device qs claimed in claim 1 with an internal combustion engine lubricated by a liquid lubricant under pressure, wherein the pressure sensitive device is connected to the engine so as to be subject to the pressure of the liquid lubricant.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-09 | 1978-06-10 | 1978-12-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-09 | 1982-06-10 | 1982-12-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-09 | 1986-06-10 | 1986-12-10 | $7700.00 | Window Closed / Lapsed |